C#学习二

1. 编写一个控制台应用程序，可根据输入的月份判断所在季节。
4. 

   using System;

   using System.Collections.Generic;

   using System.Linq;

   using System.Text;

   namespace 实验一

   {

       class Program

       {

           static void Main(string[] args)

           {

               int i;

               Console.WriteLine("***********欢迎进入季节判断系统(气象划分法)***************");

               while (true)

               {

                   Console.WriteLine("菜单：");

                   Console.WriteLine("           1.1月    2.2月    3.3月           ");

                   Console.WriteLine("           4.4月    5.5月    6.6月           ");

                   Console.WriteLine("           7.7月    8.8月    9.9月           ");

                   Console.WriteLine("           10.10月  11.11月  12.12月         ");

                   Console.WriteLine("           13.退出                           ");

                   Console.WriteLine("请输入月份序号：");

                   i = int.Parse(Console.ReadLine());

                   switch (i)

                   {

                       case 3:

                       case 4:

                       case 5: Console.WriteLine("此月份在春季。。。"); break;

                       case 6:

                       case 7:

                       case 8: Console.WriteLine("此月份在夏季。。。"); break;

                       case 9:

                       case 10:

                       case 11: Console.WriteLine("此月份在秋季。。。"); break;

                       case 12:

                       case 1:

                       case 2: Console.WriteLine("此月份在冬季。。。"); break;

                       case 13: Console.WriteLine("退出成功，再见！！！"); break;

                       default: Console.WriteLine("输入错误！！！"); break;

                   }//switch结束

                   if (i == 13) break; //退出系统

               }//while结束

           }

       }

   }